[crote]

Yes, but the carefully crafted bad data should be explainable.

Instead of committing blobs, why not commit documented code which generates those blobs? For example, have a script compress a bunch of bytes of well-known data, then have it manually corrupt the bytes belonging to file size in the archive header.

[uecker]

Maybe, but it is generally much more work to do than including a minimized test case which may already exist. But I would argue that binary blobs for testing are not the problem but the code that allows things from a binary blob to be executed during building and/or later at run-time.